fix(profile): 修复最近学习时间显示为空的问题

@@ -31,14 +31,9 @@ declare module 'vue' {
     UserAgreement: typeof import('./components/ui/UserAgreement.vue')['default']
     VanActionSheet: typeof import('vant/es')['ActionSheet']
     VanButton: typeof import('vant/es')['Button']
-    VanCalendar: typeof import('vant/es')['Calendar']
     VanCellGroup: typeof import('vant/es')['CellGroup']
     VanCheckbox: typeof import('vant/es')['Checkbox']
-    VanCol: typeof import('vant/es')['Col']
-    VanConfigProvider: typeof import('vant/es')['ConfigProvider']
-    VanDatePicker: typeof import('vant/es')['DatePicker']
     VanDialog: typeof import('vant/es')['Dialog']
-    VanDivider: typeof import('vant/es')['Divider']
     VanEmpty: typeof import('vant/es')['Empty']
     VanField: typeof import('vant/es')['Field']
     VanForm: typeof import('vant/es')['Form']
@@ -46,15 +41,10 @@ declare module 'vue' {
     VanImage: typeof import('vant/es')['Image']
     VanImagePreview: typeof import('vant/es')['ImagePreview']
     VanList: typeof import('vant/es')['List']
-    VanLoading: typeof import('vant/es')['Loading']
-    VanNavBar: typeof import('vant/es')['NavBar']
-    VanOverlay: typeof import('vant/es')['Overlay']
     VanPicker: typeof import('vant/es')['Picker']
-    VanPickerGroup: typeof import('vant/es')['PickerGroup']
     VanPopup: typeof import('vant/es')['Popup']
     VanProgress: typeof import('vant/es')['Progress']
     VanRate: typeof import('vant/es')['Rate']
-    VanRow: typeof import('vant/es')['Row']
     VanSwipe: typeof import('vant/es')['Swipe']
     VanSwipeItem: typeof import('vant/es')['SwipeItem']
     VanTab: typeof import('vant/es')['Tab']

@@ -64,7 +64,7 @@
                   d="M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2"
                 />
               </svg>
-              <span>最近学习：{{ record.recent_study_time }}</span>
+              <span>最近学习：{{ record.recent_study_time ? record.recent_study_time : '暂无' }}</span>
             </div>
             <div class="flex items-center">
               <div class="flex-1">